what? if u are with dummy u cant possible hold 2 keys separate unless u have 2 pc's playing. As i said u dont have collision for that part, just do dummy copy and both go in 1 side, because of no collision u will be stack inside each other and just hold a or d depending on which side u went
well the big brain dummy player comes by and does it by jumping in the freeze with first, holding left/right then fast switch to the other one to control it and do the part
think twice.
Maybe change the background a bit or make a few bushes to give it a little more colour.